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Date: Mon, 12 May 2014 16:18:50 +0200
From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To: Kishon Vijay Abraham I <kishon@...com>,
Antoine Ténart
<antoine.tenart@...e-electrons.com>, tj@...nel.org
CC: alexandre.belloni@...e-electrons.com,
thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] phy: add a driver for the Berlin SATA PHY
On 05/12/2014 02:46 PM, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Monday 12 May 2014 02:46 PM, Antoine Ténart wrote:
>> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
>>
>> Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
>> ---
>> drivers/phy/Kconfig | 5 ++
>> drivers/phy/Makefile | 1 +
>> drivers/phy/phy-berlin-sata.c | 179 ++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 185 insertions(+)
>> create mode 100644 drivers/phy/phy-berlin-sata.c
>>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 4906c27fa3bd..b31b1986fda4 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -15,6 +15,11 @@ config GENERIC_PHY
>> phy users can obtain reference to the PHY. All the users of this
>> framework should select this config.
>>
>> +config PHY_BERLIN_SATA
>> + bool
>> + depends on ARCH_BERLIN && OF
>> + select GENERIC_PHY
>> +
>> config PHY_EXYNOS_MIPI_VIDEO
>> tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver"
>> depends on HAS_IOMEM
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 7728518572a4..40278706ac1b 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -3,6 +3,7 @@
>> #
>>
>> obj-$(CONFIG_GENERIC_PHY) += phy-core.o
>> +obj-$(CONFIG_PHY_BERLIN_SATA) += phy-berlin-sata.o
>> obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o
>> obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
>> obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
>> diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
>> new file mode 100644
>> index 000000000000..f20f5ece1a7f
>> --- /dev/null
>> +++ b/drivers/phy/phy-berlin-sata.c
>> @@ -0,0 +1,179 @@
>> +/*
>> + * Marvell Berlin SATA PHY driver
>> + *
>> + * Copyright (C) 2014 Marvell Technology Group Ltd.
>> + *
>> + * Antoine Ténart <antoine.tenart@...e-electrons.com>
>> + *
>> + * This file is licensed under the terms of the GNU General Public
>> + * License version 2. This program is licensed "as is" without any
>> + * warranty of any kind, whether express or implied.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/io.h>
>> +#include <linux/platform_device.h>
>> +
>> +#define HOST_VSA_ADDR 0x0
>> +#define HOST_VSA_DATA 0x4
>> +
>> +#define CONTROL_REGISTER 0x0
>> +#define MBUS_SIZE_CONTROL 0x4
>> +
>> +#define POWER_DOWN_SATA0 BIT(6)
>> +#define POWER_DOWN_SATA1 BIT(14)
>> +#define MBUS_WRITE_REQUEST_SIZE_128 (BIT(2) << 16)
>> +#define MBUS_READ_REQUEST_SIZE_128 (BIT(2) << 19)
>> +
>> +#define BERLIN_SATA_PHY_NB 2
>> +
>> +#define to_berlin_sata_phy_priv(desc) \
>> + container_of((desc), struct priv, phys[(desc)->index])
>> +
>> +struct phy_desc {
>
> to be consistent, lets name it phy_berlin_desc.
>> + struct phy *phy;
>> + u32 val;
>> + unsigned index;
>> +};
>> +
>> +struct priv {
And phy_berlin_priv then?
[...]
>> +static int phy_berlin_sata_probe(struct platform_device *pdev)
>> +{
>> + struct phy *phy;
>> + struct phy_provider *phy_provider;
>> + struct priv *priv;
>> + struct resource *res;
>> + int i;
>> +
>> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>> + if (!priv)
>> + return -ENOMEM;
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + priv->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
>> + if (IS_ERR(priv->base))
>> + return PTR_ERR(priv->base);
>> +
>> + phy = devm_phy_create(&pdev->dev, &phy_berlin_sata_ops, NULL);
>> + if (IS_ERR(phy))
>> + return PTR_ERR(phy);
>> +
>> + dev_set_drvdata(&pdev->dev, priv);
>> + spin_lock_init(&priv->lock);
>> +
>> + for (i = 0; i < BERLIN_SATA_PHY_NB; i++) {
>
> huh.. this should come from dt data. For devices which have multiple PHYs, each
> PHY should be modelled as the sub-node of the *PHY provider* device node.
Just to make sure we get it right:
You want the PHY (provider) node look like this:
sata_phy: phy@...900a0 {
compatible = "marvell,berlin-sata-phy";
reg = <0xf7e900a0 0x10>;
#address-cells = <1>;
#size-cells = <0>;
#phy-cells = <1>;
status = "okay";
sata_phy0: phy@0 { reg = <0>; };
sata_phy1: phy@1 { reg = <1>; };
};
and parse the number of individual PHYs with
for_each_child_of_node()?
Sebastian
>> + struct phy *phy = devm_phy_create(&pdev->dev,
>> + &phy_berlin_sata_ops, NULL);
>> + if (IS_ERR(phy)) {
>> + dev_err(&pdev->dev, "failed to create PHY %d\n", i);
>> + return PTR_ERR(phy);
>> + }
>> +
>> + priv->phys[i].phy = phy;
>> + priv->phys[i].val = desc[i].val;
>> + priv->phys[i].index = i;
>> + phy_set_drvdata(phy, &priv->phys[i]);
>> +
>> + /* Make sure the PHY is off */
>> + phy_berlin_sata_power_off(phy);
>> + }
>> +
>> + phy_provider = devm_of_phy_provider_register(&pdev->dev,
>> + berlin_sata_phy_xlate);
>> + if (IS_ERR(phy_provider))
>> + return PTR_ERR(phy_provider);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id phy_berlin_sata_of_match[] = {
>> + { .compatible = "marvell,berlin-sata-phy" },
>> + { },
>> +};
>> +
>> +static struct platform_driver phy_berlin_sata_driver = {
>> + .probe = phy_berlin_sata_probe,
>> + .driver = {
>> + .name = "phy-berlin-sata",
>> + .owner = THIS_MODULE,
>> + .of_match_table = phy_berlin_sata_of_match,
>> + },
>> +};
>> +module_platform_driver(phy_berlin_sata_driver);
>> +
>> +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
>> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@...e-electrons.com>");
>> +MODULE_LICENSE("GPL");
>
> GPL v2 as the file header states so?
>
> Thanks
> Kishon
>
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